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UPI topology discovery relies on data from KTILP0 (offset 0x94) and KTIPCSTS (offset 0x120) registers which reside under IIO bus(3) on SKX/CLX. This patch enable UPI topology discovery on Skylake Server. Topology is exposed through attributes /sys/devices/uncore_upi_<pmu_idx>/dieX, where dieX is file which holds "upi_<idx1>:die_<idx2>" connected to this UPI link. Signed-off-by: Alexander Antonov <alexander.antonov@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Kan Liang <kan.liang@linux.intel.com> Link: https://lore.kernel.org/r/20221117122833.3103580-7-alexander.antonov@linux.intel.com
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.